Open authorized application in a new window (#2250)

Like it's already done when you click on an application from a toot, it's opening in a new window.
https://github.com/tootsuite/mastodon/blob/0254ee9795822ec75ff64ace6ec2b91573bc9a52/app/views/stream_entries/_detailed_status.html.haml#L41

app/views/oauth/authorized_applications/index.html.haml

@@ -15,7 +15,7 @@
           - if application.website.blank?
             = application.name
           - else
-            = link_to application.name, application.website
+            = link_to application.name, application.website, target: '_blank', rel: 'noopener'
         %th= application.scopes.map { |scope| t(scope, scope: [:doorkeeper, :scopes]) }.join('<br />').html_safe
         %td= l application.created_at
         %td